Countably regular good spaces and almost Cκ-spaces
Submitted: 2024-06-30
|Accepted: 2024-11-14
|Published: 2025-04-01
Copyright (c) 2025 Arash Hayati, Mehrdad Namdari, Somayeh Soltanpour

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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Keywords:
Functionally countable subalgebra, space of countable pseudocharacter, almost-resolvable space, CUC-space, CRG-space, almost Cκ-Baire space, almost CP-point, almost CP-space
Supporting agencies:
Shahid Chamran University of Ahvaz
Abstract:
In this paper, we build upon our previous studies by redefining fundamental concepts and transferring them from rings of continuous functions to rings of continuous functions with countable images. This article will focus on regular good spaces (``"RG-spaces", for short) and related concepts. Specifically, we introduce and examine two generalizations of RG-spaces, calling countably regular good spaces and strongly countably regular good spaces.
References:
F. Azarpanah, O. A. S. Karamzadeh, Z. Keshtkar, and A. R. Olfati, On maximal ideals of C_c(X) and the uniformity of its localization, Rocky Mt. J. Math. 48 (2018), 345-384. https://doi.org/10.1216/RMJ-2018-48-2-345
F. Azarpanah, E. Ghashghaei, and M. Ghoulipour, C(X): Something old and something new. Commun. Algebra 49 (2020), 185-206. https://doi.org/10.1080/00927872.2020.1797070
R. Bolstein, Sets of points of discontinuity, Proc. Amer. Math. Soc. 38 (1973), 193-197. https://doi.org/10.1090/S0002-9939-1973-0312457-9
G. H. Butcher, An extension of the sum theorem of dimension theory, Duke Math. 18 (1951), 859-874. https://doi.org/10.1215/S0012-7094-51-01881-9
M. Ghadermazi, O. A. S. Karamzadeh, and M. Namdari, C(X) versus its functionally countable subalgebra, Bull. Iran. Math. Soc. 245 (2019), 173-187. https://doi.org/10.1007/s41980-018-0124-8
M. Ghadermazi, O. A. S. Karamzadeh, and M. Namdari, On the functionally countable subalgebra of C(X), Rend. Sem. Mat. Univ. Padova, 129 (2013), 47-69. https://doi.org/10.4171/rsmup/129-4
L. Gillman and M. Jerison, Rings of Continuous Functions, The University Series in Higher Math., Van Nostrand, Princeton, N. J., 1960. https://doi.org/10.1007/978-1-4615-7819-2
A. Hayati, M. Namdari, and M. Paimann, On countably uniform closed-spaces, Quaest. Math. 42 (2019), 593-604. https://doi.org/10.2989/16073606.2018.1476415
M. Henriksen, R. Raphael and R.G. Woods, A minimal regular ring extension of C(X), Fund. Math. 172 (2002), 1-17. https://doi.org/10.4064/fm172-1-1
O. A. S. Karamzadeh and Z. Keshtkar, On c-realcompact spaces, Quaestiones Mathematicae 41 (2018), 1135-1167. https://doi.org/10.2989/16073606.2018.1441919
O. A. S. Karamzadeh, M. Namdari, and S. Soltanpour, On the locally functionally countable subalgebra of C(X), Appl. Gen. Topol. 16, no. 2 (2015), 183-207. https://doi.org/10.4995/agt.2015.3445
J. F. Kennison, Structure and co-structure for strongly regular rings, J. Pure. Appl. Algebra 5 (1974), 321-332. https://doi.org/10.1016/0022-4049(74)90041-3
R. Levy, Almost P-spaces, Can. J. Math. 29 (1977), 284-288. https://doi.org/10.4153/CJM-1977-030-7
R. Levy and M.D. Rice, Normal P-spaces and the G_delta-topology, Colloq. Math. 44 (1981), 227-240. https://doi.org/10.4064/cm-44-2-227-240
S. Mehran, M. Namdari, and S. Soltanpour, On the essentiality and primeness of λ-super socle of C(X), Appl. Gen. Topol. 19, no. 2 (2018), 261-268. https://doi.org/10.4995/agt.2018.9058
M. Namdari, The story of rings of continuous functions in Ahvaz: From C(X) to C_c(X), Journal of the Iranian Mathematical Society 4, no. 2 (2023), 149-177.
R. Raphael and R. G. Woods, On RG-spaces and the regularity degree, Appl. Gen. Topol. 7 (2006), 72-101. https://doi.org/10.4995/agt.2006.1934
S. Soltanpour, On the locally socle of C(X) whose local cozeroset is cocountable (cofinite), Hacettepe Journal of Mathematics and Statistics 48, no. 5 (2019), 1430-1436. https://doi.org/10.15672/HJMS.2018.583
F. D. Tall, The countable chain condition versus separability-applications of Martin's axiom, General Topology Appl. 4 (1974), 315-339. https://doi.org/10.1016/0016-660X(74)90010-5



